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https://issues.apache.org/jira/browse/KYLIN-2135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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kangkaisen updated KYLIN-2135:
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    Attachment: new.png

when we use 10 reducers to deal with the 14th column, the elapsed time become 
about 25 minutes.

> Enlarge FactDistinctColumns reducer number
> ------------------------------------------
>
>                 Key: KYLIN-2135
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2135
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>    Affects Versions: v1.5.4.1
>            Reporter: kangkaisen
>            Assignee: kangkaisen
>         Attachments: new.png, old.png
>
>
> When the hive table has billions of rows and use global dictionary for 
> precise count distinct measures, the  {{Extract Fact Table Distinct Columns}} 
> job will run o long time.
> So we could use more reducer to deal with the one column.



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